Adjustable roof drain

Abstract

An adjustable roof drain has an extension and a base ring. An adjusting mechanism on an inner surface of the extension engages an adjusting mechanism on an outer surface of the base ring to adjustably set the position of the extension relative to the base ring. Preferably the adjusting mechanisms are threaded connections. A bead of sealant may be placed in a groove that is exposed at the joint between the two parts after the position is set.

1 . An adjustable roof drain, comprising: 
 a drain body adapted to connect to a drain pipe;    a base ring, the base ring having a first wall portion defining a first flow passage, the first wall portion having an outer surface, the outer surface having an adjusting mechanism, and the base ring having an engagement portion for connection with the drain body; and    an extension that adjustably mounts onto the first wall portion of the base ring, the extension having a second wall portion defining a second flow passage, the second wall portion having an inner surface, the inner surface having an adjusting mechanism located thereon,    the adjusting mechanism of the base ring being engageable with the adjusting mechanism of the extension to adjustably set the position of the extension relative to the base ring.    
   
   
       2 . The adjustable roof drain of  claim 1  wherein the adjusting mechanism of the base ring comprises male threads and the adjusting mechanism of the extension comprises female threads.  
   
   
       3 . The adjustable roof drain of  claim 1  wherein the engagement portion includes a radially extending flange.  
   
   
       4 . The adjustable roof drain of  claim 1  wherein the extension further comprises a radially extending flange for engaging roofing material.  
   
   
       5 . The adjustable roof drain of  claim 1  wherein the inner surface of the extension and the outer surface of the base ring operably form a circumferential groove for receiving sealant material.  
   
   
       6 . The adjustable roof drain of  claim 1  wherein a sealant groove is formed around an upper end portion of the base ring.  
   
   
       7 . The adjustable roof drain of  claim 1  wherein the drain body is made from a support portion and a first pipe connector portion, the first pipe connector portion being removably attached to the support portion and replaceable with a second pipe connector portion for modifying the drain body to connect to a different drain pipe configuration.  
   
   
       8 . A roof drain that can adjust for installation on roofs with roof materials of different thickness, the roof drain comprising: 
 a drain body having an outlet portion and an upper end portion, the outlet portion having a generally cylindrical sidewall centered on an axis for connecting to a drain pipe, the upper end portion including a first radially extending flange for engaging the roofing material;    a base ring having a first wall portion, a second radially extending flange, and an upper end portion, the first wall portion having a generally cylindrical configuration centered on the axis with parallel, cylindrical inner and outer side surfaces defining a first flow passage, the second radially extending flange adapted to engage a radially extending upper surface of the drain body, the upper end portion having male threads along an outer surface; and    an extension having a second wall portion with a generally cylindrical configuration centered on an axis with parallel, cylindrical inner and outer side surfaces defining a second flow passage, the inner side surface including female threads to threadably engage the male threads of the base ring to adjustably position the extension relative to the axial position of the base ring.    
   
   
       9 . A method of installing an adjustable roof drain, comprising the steps of: 
 mounting a drain body to a drain pipe;    mounting a base ring having an adjusting mechanism on an outer surface to the drain body;    engaging an extension having an adjusting mechanism on an inner surface with the adjusting mechanism of the base ring; and    adjusting the axial position of the extension relative to the base ring.    
   
   
       10 . The method of  claim 9  wherein the inner surface of the extension and the outer surface of the base ring operably form a circumferential groove for receiving sealant material and further comprising the step of: 
 applying sealant into the circumferential groove to effect a seal between the extension and the base ring.    
   
   
       11 . The method of  claim 9  further comprising the step of: 
 installing roofing materials onto the roof after the step of mounting the base ring to the drain body;    installing a membrane to cover the roofing materials after the step of adjusting the axial position of the extension relative to the base ring; and    mounting a clamp ring onto the extension to secure the membrane between the clamp ring and the extension.    
   
   
       12 . The method of  claim 9  wherein the adjusting mechanism on the inner surface of the extension includes female threads and the adjusting mechanism on the outer surface of the base ring includes male threads.  
   
   
       13 . The method of  claim 12  further wherein the step of adjusting the axial position of the extension relative to the base ring comprises: 
 screwing the extension partially onto the base ring,    applying sealant to a groove operably formed by the inner surface of the extension and the outer surface of the base ring, and    continuing to screw the extension onto the base ring until an upper surface of the extension contacts the roofing materials.